temporary support: @FetchRequest

[YusukeHosonuma]

No useful value can be obtained from @FetchRequest at currently SwiftPrettyPrint strategy. (maybe)
But the output is disturbing currently, therefore temporary support in this PR.

As-is

ContentView(
    viewContext: @Environment(<NSManagedObjectContext: 0x600001960340>),
    _items: FetchRequest<Item>(
        managedObjectContext: @Environment(<NSManagedObjectContext: 0x600001960340>),
        controller: @StateObject(<_TtGC7SwiftUI15FetchControllerT_C15CoreDataSandbox4ItemGVS_14FetchedResultsS2___: 0x600000679080>),
        results: @State(nil),
        transaction: Transaction(plist: [Key<AnimationKey> = Optional(AnyAnimator(SwiftUI.BezierAnimation(duration: 0.35, curve: SwiftUI.(unknown context at $7fff5df354c0).BezierTimingCurve(ax: 0.52, bx: -0.78, cx: 1.26, ay: -2.0, by: 3.0, cy: 0.0))))]),
        deferredFetchRequest: DeferredFetchRequest<Item>(
            $__lazy_storage_$_result: Optional(<NSFetchRequest: 0x600000971650> (entity: Item; predicate: ((null)); sortDescriptors: ((
                "(timestamp, ascending, NO, compare:)"
            )); type: NSManagedObjectResultType; )),
            resolve: () -> NSFetchRequest(
            )
        )
    )
)

To be

prettyPrint

ContentView(
    viewContext: <NSManagedObjectContext: 0x6000026b0680>,
    items: <can not lookup>
)

prettyPrintDebug

ContentView(
    viewContext: @Environment(<NSManagedObjectContext: 0x6000026b0680>),
    items: @FetchRequest(<can not lookup>)
)

[codecov-commenter]

Codecov Report

Merging #190 (bf0f113) into main (334a7ff) will increase coverage by 0.54%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
+ Coverage   76.41%   76.96%   +0.54%     
==========================================
  Files          13       13              
  Lines         687      686       -1     
==========================================
+ Hits          525      528       +3     
+ Misses        162      158       -4     

Impacted Files	Coverage Δ
Sources/Core/PrettyDescriber.swift	71.80% <90.00%> (+1.07%)	⬆️

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[sahara-ooga]

I think this is an appropriate interim measure to move forward.